URGENT ¥¥¥ Obama says China getting tougher on N.Korea

US President Barack Obama said that China was taking a tougher line against North Korea's nuclear program as he credited new President Xi Jinping with taking more responsibility in the world.

"We've seen the Chinese take more seriously the problem of constant provocation and statements from the North Koreans -- rejecting the nuclearization," Obama told "The Charlie Rose Show" in an interview broadcast Monday.